Liquid dispensing system with improved sealing augering screw and method for dispensing
AssigneeSpeedline Technologies, Inc.
InventorsThomas J. White, William A. Cavallaro
Life of this patent
Estimating the term…
Abstract
A liquid dispenser has an augering screw that serves both a metering function and a valving function. The augering screw is axially movable between a position in which fluid can flow and a sealing position in which liquid flow through the nozzle is substantially prevented. The screw is preferably designed with a curved contour between the threads and with a plurality of thread-defining channels to allow liquid to fill more completely around the screw and to dispense more liquid with fewer screw turns than prior screw designs.
Claims20
An apparatus for dispensing small metered amounts of liquid onto a medium, the apparatus comprising:
- a housing;
- an augering screw having a lower end and mounted in the housing, the augering screw and housing defining an augering chamber for receiving liquid;
- and
- a needle fluidly coupled to the augering chamber for receiving liquid from said augering chamber and having an outlet for dispensing the received liquid onto the medium the needle having a valve seat located between the augering chamber and the outlet of the needle, the valve seat being constructed and arranged to receive the lower end of the augering screw.
A needle for an apparatus that dispenses small metered amounts of liquid onto a medium, the needle comprising:
- a head end having a centrally located annular region;
- a valve seat having a conically shaped region that receives a liquid wherein the valve seat is located inside the annular region of said head end;
- and
- a nozzle for dispensing the received liquid onto the medium, said nozzle is fluidly coupled to the head end through the conically shaped region of said valve seat.
An apparatus for dispensing small metered amounts of liquid onto a medium, the apparatus comprising:
- a housing;
- an augering screw having a lower end and mounted in the housing, the augering screw and housing defining an augering chamber for receiving liquid;
- a connector in tandem with a needle fluidly coupled to the augering chamber for receiving liquid from said augering chamber, the needle having an outlet for dispensing the received liquid onto the medium;
- and
- a valve seat located between the augering chamber and the outlet of the needle, and constructed and arranged to receive the lower end of the augering screw.
An apparatus for dispensing small metered amounts of liquid onto a medium the apparatus comprising:
- a housing;
- an augering screw having a lower end and mounted in the housing, the augering screw and housing defining an augering chamber for receiving liquid;
- a needle fluidly coupled to the augering chamber for receiving liquid from said augering chamber and having an outlet for dispensing the received liquid onto the medium;
- a valve seat located between the augering chamber and the outlet of the needle;
- and
- a connector for placing said needle in contact with the valve seat.
A dispensing system for dispensing small metered amounts of liquid onto a medium, comprising:
- a housing;
- a dispenser having a lower end and mounted in the housing the dispenser and housing defining a chamber for receiving liquid;
- a needle fluidly coupled to the chamber for receiving liquid from said chamber and said needle having an outlet for dispensing the received liquid onto the medium;
- and
- a valve seat located between said chamber and the outlet of the needle, and constructed and arranged to receive the lower end of the dispenser.
Dependencies are inferred from the claim text.